Atlanta -LRB- CNN -RRB- -- The remnants of Tropical Storm Lee settled in over the mid-Atlantic and Northeast on Wednesday , prompting warnings of heavy rain and flash flooding in areas from Washington up to western New England , the National Hurricane Center said .

Several rounds of heavy rain lie in store for much of the region the next couple of days , with an additional 2 to 6 inches forecast -- and in isolated cases as much as 10 inches .

This comes on top of the heavy precipitation that already has fallen in the region as the storm , which blew up from the Gulf of Mexico , ran up against an extra-tropical low-pressure system centered across the central Appalachian Mountains and stalled .

`` These rains may cause life-threatening flash floods and mudslides , '' the prediction center said .

A flash flood warning for the District of Columbia remains in effect till midnight tonight , with damaging wind gusts and severe thunderstorms also possible . A news release from the D.C. Homeland Security and Emergency Management Agency urged people to `` avoid driving when possible , drive very carefully when you must drive , and stay alert for pooling water that you can not drive through . ''

Earlier Wednesday , the storm caused a series of air traffic delays across the Northeast . Multiple flights were delayed by over an hour in the New York metro area and by up to 55 minutes in Boston and Philadelphia .

The forecast was unwelcome news for waterlogged Vermont and northern New York , which could receive another 1 to 3 inches of rain with up to 4 inches possible in some spots by Wednesday night .

`` We could get flooded again , '' Robin Stewart of Paterson , New Jersey , told CNN affiliate WCBS . `` We 're real concerned about that . ''

Garbage remained piled outside Stewart 's home after flooding from Irene wrecked her lower level , WCBS said . Stewart has n't had power for more than a week , and she is afraid more rain will flood her home again and keep her in the dark even longer .

`` When everybody else is on their way to recovery , we 're getting flooded again , '' Stewart said .

Some eye-popping storm rainfall totals in the Northeast were recorded through 5 p.m. Wednesday in Becket , Massachusetts -LRB- 8.11 inches -RRB- ; Rockaway , New Jersey -LRB- 8.43 -RRB- ; Phillipsburg , New Jersey -LRB- 7.9 -RRB- ; and Forks , Bethlehem and Dover , Pennsylvania -LRB- just over 7 inches -RRB- .

Lee left at least four people dead as it crossed the Southeast , dumping as much as 12 to 15 inches of rain in many places .

In Gwinnett County , Georgia , just outside Atlanta , firefighters said Tuesday they found the body of a man who drowned in a rain-swollen creek near Norcross .

In Baldwin County , Alabama , police said they no longer believe a missing 16-year-old boy is alive . The teen was last seen on a beach near Gulf Shores on Sunday .

A flooding death was also reported in rural northeast Mississippi , where one person drowned after floodwater swept away a vehicle in Tishomingo County , emergency officials said .

And a woman was struck by a tree and killed in Chattanooga , Tennessee , early Tuesday .

CNN 's Sarah Dillingham contributed to this report .

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NEW : Remnants of Lee settle in Wednesday over mid-Atlantic , Northeast

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NEW : Flash flood warnings range from D.C. to western New England

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Rainfall amounts of up to 10 inches are forecast in isolated pockets

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Lee is blamed for at least four deaths in the South